Improvement in pigment-furnaces



2 Sheets-Sheet 1.

. KRUM Pigment-Furnace.

Patented Oct. 8,1878.

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2 Sheets-Sheet 2v H. KRUM. Pigment-Furnace.

A22 vezzialr lkgamnted 002 8, 1878.

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l F'n l I -ll'l IIIIL IIIIIMIIIIIIIIIIII UNITED STATES PATENT QFFIOE.

HENRY KRUM, OF CINCINNATI, OHIO.

IMPROVEMENT IN PlGMENT-FURNACES.

Specification forming part of Letters Patent No. 208,828, dated October 8, 1878; application filed July 11, 1878.

To all whom it may concern:

Be it known that I, HENRY KRUM, of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Furnaces for the Manufacture of Oxide of Zinc; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of my invention is to produce, as a new article of manufacture, an oxide of zinc that is of a superior quality to that now in use, and it consists of an apparatus or furnace provided with fiues and a chamber, arranged With certain dampers in such manner that the smoke and gases or products of combustion are excluded from the workingchamber, so as not to come in contact with the spelter, zinc ore, galvanized iron, &c., from which it is intended to extract the oxide of zinc, which is to be caught and condensed in a balloon, as will be hereinafter described.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawing, Figure l is a side elevation of my furnace. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a horizontal section on lineman Fig. 4 is a cross-section on line y y. Fig. 5 is a cross-section on line 2 2.

In the drawing, A represents the furnace, which is provided with the fire-chamber B, having a suitable grate, b, and ash-pit O; and it communicates with the working-chamberD by means of a number of horizontal fines or passages, E, and flues f in the bridge F. In the rear wall of the furnace, and opposite each of the fiues E, is arranged a hole, 0, provided with a plug, and through these holes the fiues may be cleaned. At the rear end of the working-chamber is formed a bridge-wall, F, provided with fines f, which can be closed, if desired, at certain times, hereinafter described, by a tile or damper, G, of fire-clay or other suitable material. At the rear end of the working-chamber is arranged a small smokestack, II, provided with a sliding damper, h, through which the smoke escapes when it is open. At the forward end is a large stack, I, also provided with a sliding damper, t, which is opened when starting the fires. Near the stack 1 is arranged a curved or inclined flue, K, having a sliding damper, k, and over the mouth of this flue a balloon, K, of any suitable material, (shown in dotted lines in Fig. 5,) is attached, into which the volatilized zinc passes, and is therein retained.

The balloon is provided with one or more openings, through which the oxide of zinc is withdrawn into suitable receptacles. In the side of the furnace are arranged the doors L, through which the working chamber D is charged with the spelter, zinc ore, galvanizediron scraps, &c. Another door, M, is arranged in the fire-chamber, through which the fuel is introduced.

The operation is as follows: The fire is made on the grate b, the tile or damperGis removed, the damper in the stack I opened, and the products of combustion passing through the lines heat the working-chamber in their passage, and finally pass out at the stack. When the fire is well started and burning the tile G is replaced, the damper in the stack H opened to allow the smoke to escape, and the spelter, scraps of galvanized iron, or other material is introduced through doors L into the workingchamber. The damper k in the curved flue K is then opened, after the balloon has been attached. The fire, acting on the under side of the floor d of the working-chamber, acts on the material contained therein, which soon melts and begins to boil, and by admitting air through the doors L in the side of the furnace, which are raised slightly for a few minutes at a time, and it will cause the highly-heated and boiling material to burn, which thereby volatilizes the zinc, which is carried through the flue K into the balloon, and, condensing therein, forms oxide of zinc, and can be withdrawn into barrels or other suitable receptacles. The smoke from the fire passes out through the small stack H.

Having thus described my invention, what I claim, and desire to secure by Letters Paten 1s- 1. The furnace herein described, consisting of the fire-chamber i, fines *L working-climn- In testimony that 1 claim the fbreg'oing as her 1), stacks H and I, flue K, and balloon K, my own I hereby affix my signature in pre substantially as shown, and fin the purpose ence of twu witnesses.

herein set; forth.

2. 1n the furnace herein described, the com- HENRY KRUM. bination ofa firechamber, B, tines E, and workingchamber I) with the bridge-wall F, lmv- Witnesses: ing fluesf, tile 01' damper (1, and curved flue Ii, CABELL WILLIAMSON,

K, as shown, and 1'01 the purpose set forth ALFRED LEE. 

